Extension Spring, Ultra Precision, High Carbon Steel, Plain, End Type Full Twist Loops, Overall Length 5/8 In, Outside Dia 0.240 In, Wire Dia 0.037 In, Load 8.70 Lbs, Deflection @ Load 0.15 In, Initial Tension 0.80 Lbs, Spring Rate 54.7 Lbs/In, Meets/Exceeds ASTM A228 and AMS 5112, Package 3